I am looking to stream live video from peoples personal webcams/video feeds etc on my site. I want to do something similar to justin.tv, but I have no idea where to start. Anyone know where I can look to find out how to accomplish this? Is there products or scripts that will integrate with this functionality?

I know how to stream videos that are uploaded on our server etc. This isnt a simple question about that, I want to know how to connect others video cameras to a live stream on my site.

I have also searched the net with no luck. Maybe I am not calling it the correct thing??